diff --git a/CMakeLists.txt b/CMakeLists.txt
index 321232378..22e3978d1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -88,6 +88,9 @@ else()
     endif()
 endif()
 
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DQT_WARN_DEPRECATED_UP_TO=0x060200")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DQT_DISABLE_DEPRECATED_UP_TO=0x060000")
+
 # Fix aarch64 build for toml++
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DTOML_ENABLE_FLOAT16=0")
 
diff --git a/launcher/StringUtils.cpp b/launcher/StringUtils.cpp
index edda9f247..2ea67762e 100644
--- a/launcher/StringUtils.cpp
+++ b/launcher/StringUtils.cpp
@@ -53,7 +53,7 @@ static inline QChar getNextChar(const QString& s, int location)
 int StringUtils::naturalCompare(const QString& s1, const QString& s2, Qt::CaseSensitivity cs)
 {
     int l1 = 0, l2 = 0;
-    while (l1 <= s1.count() && l2 <= s2.count()) {
+    while (l1 <= s1.size() && l2 <= s2.size()) {
         // skip spaces, tabs and 0's
         QChar c1 = getNextChar(s1, l1);
         while (c1.isSpace())
diff --git a/launcher/modplatform/legacy_ftb/PackFetchTask.cpp b/launcher/modplatform/legacy_ftb/PackFetchTask.cpp
index a0beeddcc..aea9cefad 100644
--- a/launcher/modplatform/legacy_ftb/PackFetchTask.cpp
+++ b/launcher/modplatform/legacy_ftb/PackFetchTask.cpp
@@ -79,7 +79,7 @@ void PackFetchTask::fetchPrivate(const QStringList& toFetch)
         QObject::connect(job, &NetJob::succeeded, this, [this, job, data, packCode] {
             ModpackList packs;
             parseAndAddPacks(*data, PackType::Private, packs);
-            foreach (Modpack currentPack, packs) {
+            for (auto& currentPack : packs) {
                 currentPack.packCode = packCode;
                 emit privateFileDownloadFinished(currentPack);
             }
diff --git a/launcher/modplatform/legacy_ftb/PackInstallTask.cpp b/launcher/modplatform/legacy_ftb/PackInstallTask.cpp
index c8d04828c..2b9bd127a 100644
--- a/launcher/modplatform/legacy_ftb/PackInstallTask.cpp
+++ b/launcher/modplatform/legacy_ftb/PackInstallTask.cpp
@@ -160,7 +160,7 @@ void PackInstallTask::install()
         // we only care about the libs
         QJsonArray libs = doc.object().value("libraries").toArray();
 
-        foreach (const QJsonValue& value, libs) {
+        for (const auto& value : libs) {
             QString nameValue = value.toObject().value("name").toString();
             if (!nameValue.startsWith("net.minecraftforge")) {
                 continue;
diff --git a/launcher/translations/TranslationsModel.cpp b/launcher/translations/TranslationsModel.cpp
index 429ead47d..e863dfef4 100644
--- a/launcher/translations/TranslationsModel.cpp
+++ b/launcher/translations/TranslationsModel.cpp
@@ -480,7 +480,7 @@ bool TranslationsModel::selectLanguage(QString key)
     bool successful = false;
     // FIXME: this is likely never present. FIX IT.
     d->m_qt_translator.reset(new QTranslator());
-    if (d->m_qt_translator->load("qt_" + langCode, QLibraryInfo::location(QLibraryInfo::TranslationsPath))) {
+    if (d->m_qt_translator->load("qt_" + langCode, QLibraryInfo::path(QLibraryInfo::TranslationsPath))) {
         qDebug() << "Loading Qt Language File for" << langCode.toLocal8Bit().constData() << "...";
         if (!QCoreApplication::installTranslator(d->m_qt_translator.get())) {
             qCritical() << "Loading Qt Language File failed.";
diff --git a/launcher/ui/MainWindow.cpp b/launcher/ui/MainWindow.cpp
index 53e87b57e..2d8e4ebf5 100644
--- a/launcher/ui/MainWindow.cpp
+++ b/launcher/ui/MainWindow.cpp
@@ -724,7 +724,7 @@ void MainWindow::changeActiveAccount()
     QAction* sAction = (QAction*)sender();
 
     // Profile's associated Mojang username
-    if (sAction->data().type() != QVariant::Type::Int)
+    if (sAction->data().typeId() != QMetaType::Int)
         return;
 
     QVariant action_data = sAction->data();
diff --git a/launcher/ui/dialogs/skins/draw/SkinOpenGLWindow.cpp b/launcher/ui/dialogs/skins/draw/SkinOpenGLWindow.cpp
index 97fe44175..e1e539050 100644
--- a/launcher/ui/dialogs/skins/draw/SkinOpenGLWindow.cpp
+++ b/launcher/ui/dialogs/skins/draw/SkinOpenGLWindow.cpp
@@ -76,8 +76,8 @@ void SkinOpenGLWindow::mousePressEvent(QMouseEvent* e)
 void SkinOpenGLWindow::mouseMoveEvent(QMouseEvent* event)
 {
     if (m_isMousePressed) {
-        int dx = event->x() - m_mousePosition.x();
-        int dy = event->y() - m_mousePosition.y();
+        int dx = event->position().x() - m_mousePosition.x();
+        int dy = event->position().y() - m_mousePosition.y();
 
         m_yaw += dx * 0.5f;
         m_pitch += dy * 0.5f;
diff --git a/launcher/ui/instanceview/InstanceView.cpp b/launcher/ui/instanceview/InstanceView.cpp
index fa1af4266..f52c994d3 100644
--- a/launcher/ui/instanceview/InstanceView.cpp
+++ b/launcher/ui/instanceview/InstanceView.cpp
@@ -418,7 +418,7 @@ void InstanceView::mouseDoubleClickEvent(QMouseEvent* event)
 
     QModelIndex index = indexAt(event->pos());
     if (!index.isValid() || !(index.flags() & Qt::ItemIsEnabled) || (m_pressedIndex != index)) {
-        QMouseEvent me(QEvent::MouseButtonPress, event->localPos(), event->windowPos(), event->screenPos(), event->button(),
+        QMouseEvent me(QEvent::MouseButtonPress, event->position(), event->scenePosition(), event->globalPosition(), event->button(),
                        event->buttons(), event->modifiers());
         mousePressEvent(&me);
         return;
@@ -598,7 +598,7 @@ void InstanceView::dragEnterEvent(QDragEnterEvent* event)
     if (!isDragEventAccepted(event)) {
         return;
     }
-    m_lastDragPosition = event->pos() + offset();
+    m_lastDragPosition = event->position().toPoint() + offset();
     viewport()->update();
     event->accept();
 }
@@ -610,7 +610,7 @@ void InstanceView::dragMoveEvent(QDragMoveEvent* event)
     if (!isDragEventAccepted(event)) {
         return;
     }
-    m_lastDragPosition = event->pos() + offset();
+    m_lastDragPosition = event->position().toPoint() + offset();
     viewport()->update();
     event->accept();
 }
@@ -636,7 +636,7 @@ void InstanceView::dropEvent(QDropEvent* event)
 
     if (event->source() == this) {
         if (event->possibleActions() & Qt::MoveAction) {
-            std::pair<VisualGroup*, VisualGroup::HitResults> dropPos = rowDropPos(event->pos());
+            std::pair<VisualGroup*, VisualGroup::HitResults> dropPos = rowDropPos(event->position().toPoint());
             const VisualGroup* group = dropPos.first;
             auto hitResult = dropPos.second;
 
diff --git a/libraries/LocalPeer/src/LocalPeer.cpp b/libraries/LocalPeer/src/LocalPeer.cpp
index c1875bf98..3761c109e 100644
--- a/libraries/LocalPeer/src/LocalPeer.cpp
+++ b/libraries/LocalPeer/src/LocalPeer.cpp
@@ -75,7 +75,7 @@ ApplicationId ApplicationId::fromTraditionalApp()
     prefix.remove(QRegularExpression("[^a-zA-Z]"));
     prefix.truncate(6);
     QByteArray idc = protoId.toUtf8();
-    quint16 idNum = qChecksum(idc.constData(), idc.size());
+    quint16 idNum = qChecksum(idc);
     auto socketName = QLatin1String("pl") + prefix + QLatin1Char('-') + QString::number(idNum, 16).left(12);
 #if defined(Q_OS_WIN)
     if (!pProcessIdToSessionId) {